Hi, I posted about a battery problem here and determined that the battery had likely been damaged by overcharging. Motor is 3 3R777 0005. I couldn't find a new diode where I live, but had an older tractor diode which hadn't damaged the same type battery before. The problem remained: 17 volts plus charging. I want to know if someone here can instruct me how to retrofit a voltage regulator to this tractor to end this problem?? Thanks